Fwd: new rc parser

[Stanley Lieber <sl@stanleylieber.com>]

-------- Original Message --------
From: Russ Cox <rsc@swtch.com>
Sent: May 4, 2020 11:57:22 PM EDT
To: plan9port-dev <plan9port-dev@googlegroups.com>
Subject: new rc parser

Hi all,

As an experiment, I have pushed to plan9port a new rc parser
<https://github.com/9fans/plan9port/commit/47d4646eebac34c0b94951cfcf1b81ed2ca513e1>
that resolves two long-time nagging issues:

1. Equal signs (=) are now allowed unquoted
<https://github.com/9fans/plan9port/commit/ff74f7cdda7b08da6fe7c8bbcca990305fd6b547>
in command line arguments.

2. Free carats are now inserted
<https://github.com/9fans/plan9port/commit/7d6a248f2c68d70f58387afc69e73e695c3d940c>
any time two word expressions are next to each other with no spaces, not
just most of the time. For example, the Plan 9 printfont script contains a
bug of the form:

    x=$x'abc'`{def}'ghi'

The bug is that an explicit carat is needed after the }. No longer.

I tested the change by checking every rc script I could find against the
old and new parser; the printfont script mentioned above was the only
affected script (and it's not in plan9port anyway).

You can compare the parser output on any particular script using:

    diff <{rc -Y -D script} <{rc -D script}

If you run into any problems, the old parser is still available using "rc
-Y", but please file an issue so we can fix the new parser.

Best,
Russ

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